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![]() "James barrett" wrote in message ... I keep reminding myself about the articles I've read about people using window screens and rain gutters as antennas. ;-) I'll keep reading and eventually I will understand Antennas. Take comfort from the knowledge that sub-optimal antennas, including rain gutters, are still OK. Until I get a tower up, I am contenting myself with sub-optimal. Heck, I loaded up an aluminum extension ladder and had a QSO with Hawaii from San Diego. This NG had a recent thread on multiband fan dipoles. I made one and it works fine. I started with a 10m copper pipe dipole a few feet over my garage roof, coax-fed through a balun. It is parallel to the peak of the roof. I added two 20m elements of #16 insulated stranded wire (lamp cord, actually) and ran them downslope toward opposite corners of the garage roof. They make about a 45-degree angle with the 10m antenna. Construction articles encourage separating elements of different bands. The first measured 20m elements were too long and the SWR dipped at 12-something MHz. I trimmed them to 14.1 MHz, SWR = 1.1:1 at the radio. The only change to the 10m performance was a very slight increase in SWR (1.5:1 vs. 1.7:1 per MFJ-269). I output only 100 watts and have logged 20m QSO's to Canada, Alaska, Hawaii and the US East Coast on those hunks of lamp cord laying on my garage roof. I plan to add some 40m elements and see what happens. ("Let's see what happens if ... " is one of the very best things about ham radio.) "Sal" (KD6VKW) |
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